Connection info enhancement

[ChrisJonesCoG]

Loving the simple setup page, great tool, incredibly useful - nice one @timabell!

As I'm generally returning to the same database many times I like to launch SchemaExplorer with a batch file containing all the connection info in the command therein.

It occurred to me that it would be useful to show the full command line with the connection info as entered by the user in the form so that this could be copied and pasted into a batch file. Or there could be a "Download launch batch file" button with the generated command line.

A Test Connection button would also be good to prove that the info has been correctly entered and that the displayed command line is correct.